b2-20250105-203025-e825ff1

• Update macOS version requirements
• Fix macOS app identifiers: b2 and b2 Debug were not distinguishable, interfering with System Preferences > Security & Privacy > Input Monitoring setup
• Add --no-limit-speed command line option, to start the emulator with limit speed disabled
• Add disk samples for 3.5" drive
• Fix command keyboard shortcuts taking priority over BBC input
• Update ffmpeg version in macOS release